I might just have a PBR and think about how my great grandfather loved this beer. In reality I'd have a Madrugada Obscura. On the other hand, the highest abv beer I could get might make the execution go smoother

Only one?!?!? I'd probably go with a cask of one of the versions of Chocolate Rain. But close 2nd's would be RARE, MoaS, KH, and a fresh pour of Pliny the Younger as a palate cleanser... One can Dream.

I'd go with the beer Michael Jackson tops the night off with at the end of the Belgian episode of Beer Hunter. It's a scotch ale, that's all I know off the top of the head. That just seems fitting...Calling it a night, metaphorically.

Okay BA, here's a topic perhaps you might like. This is purely hypothetical : You've been found guilty of a crime and have been sentenced to death. As you await that final hour you become aware that the warden is a craft beer nut, so much that for shits and giggles he allows you one final beer of your choice. If it was your last hour on earth and you could have any ONE beer in the world, what would it be?......Go!